Improvement in steam hoisting apparatus



C. R. UTIS & N. P. (ITIS.

Steam Hnisting Apparatus.

Patented1an.'7,173.

Sk@ K UNITED STATES PATENT OFFICE.

CHARLES R. OTlS AND NORTON OTIS, OF YONKERS, NEW YORK.

IMPROVEMENT IN STEAM HOISTING APPARATUS. v

Specification forming part of Letters Patent No. 134,699, dated January7, 1873.

To all whom it may concern:

Be it known that we, CHARLES It. OTIs and NORTON P. Oris, both ofYonkers, in the county of Westchester and State of New York, haveinvented certain Improvements in Steam Hoisting Apparatus, of which thefollowing is a specification:

This invention consists in a combination, with a hoisting-drum and brakethereto, of a brake-operating steam-cylinder and a governor set inmotion by the drum for controlling the admission of steam to thebrake-operating cylinder. It also consists in a combination of thebrake-operatin g steam-cylinder, the engine which drives thehoisting-drum, and a steampipe arranged so that the admission of steamto the valve-box of the engine also admits steam to the brake-operatin gcylinder to throw the brake out of action, so as to allow of the freerotation of the drum by the engine. The invention also consists in acertain combination of .parts and devices whereby the actions, asrecited in the two preceding clauses, are obtained in a veryadvantageous manner. By these improvements the hoisting-drum may besecurely held at any desired point in the travel of the car attached toit, but is relieved when setting the engine in motion again in eitherdirect-ion; and in case of any undue velocity, arising from accident orlbreakage, the brake is applied to hold the drum.

In the accompanying drawing which forms part of this specification,Figure 1 represents `a partly-sectional front elevation of a hoistingapparatus, in part, with our improvement applied to it 5 and Fig. 2 anend view of the same, in part.

Similar letters of reference indicate corresponding portions in both 1igures of the drawing.

A A represent the engine or engines for driving the hoisting-drum B,through the intervention of any suitable means. C is a steamchest,containing the valve by which the engine is started and reversed. Infree communication with said chest, outside of the reversing-valve, is asteam-pipe, b, that is supplied with steam from the chest whenevercommunication is opened between the boiler and the chest. D is thebrakestrap or brake proper, applied to the drum and operated by theraising and lowering of a weighted lever, E, which, when down, holds thebrake on the drum. Connected with the lever E is a piston, F, arrangedto reciprocate within a cylinder, G, which has connected with it a valveor cock, H, that serves to control passages c, d, e, and f. Two of thesepassages, c and d, form connections between the valve and 'the upper andlower ends of the cylinder G. The passage e connects with the steam-pipeb, and the passage f is an exhaust-way, open either to the atmosphere orto a condenser. The cook H is operated by a governor, I, which is set inmotion by the hoisting-drum.

The operation is as follows: Prior to letting steam into the chest theweighted lever E holds tle brake D on the drum. As, however, steam isadmitted to the chest B, and, before adjusting the reversing-valve toactuate the engine in the direction required, steam passes from'thechest .B/ by the pipe b down the passage e, through the valve, and alongthe pasA sage d, thereby raising the piston F and relieving the brake,the passages c and f being then open to the exhaust. The` engine beingset going, the governor I is put in motion by the hoisting-drum; and solong as the latter does not exceed a proper velocity the valve H is notoperated sufficiently to reverse its action, but, at most, to close thepassages e and f. Should any accident occur, however, to make the drumrun unduly fast, then the velocity of the governor actuates the valve Hto open the passages d and f to the exhaust and the passages e and c tothe steam, which then acts upon the piston F cont] ointly with theweighted lever E, to apply the brake and hold the drum.

We do not restrict ourselves, however, to any particular construction ofvalve for controlling the brake, and the various connections may bedifferently made without changing the characteristic features of theinvention. Thus, it is not absolutely necessary that the brake should bemoved in both directions by the steam, as the weighted lever may besuficient, without the aid of steam, to apply the necesA sary force orfriction to thedrum, and the ad mission of steam to the brake-operatingcylinl der be restricted to the relieving of the brake, in which casethe valve controlled by the gov ernor would have to be arrangedaccordingly'.

Also-y -i'n'stealdot .aipiston `Within the brake-opl" erating'eyliuder,as'yield'ing or flexible dia phragm may be used.

. What is here claimed7 and desired to be secured by Letters Patent7is- 1. Tl'fiefeo'mbination of a hoisting-drum, a friction-brake, abrake-operating steam-cylinder, and a governor set in motion by thedrum, whereby the admission of steam to the brakeoperating cylinder isautomatically controlled by suoli governor.

2. The combinationof ,the vlorakeoperatin,gg

steam=ey1inder, the engine, andthe pipe 11,'

substantiallyas herein described, whereby the l Y Witnesses:

engine A, the governor 1,:the valve H, the

passages @,d, e, andf, the piston F,"the cylinder G, the pipe b, andvalve-chest C, essentially as and for the purpose herein set forth.

CEAS. R. OTIS. NORTON P. OTIS.

" JAs. HENDERSON; i

JOHN RAUOH.

